From all metals the one I´ve worked with the most is copper leaf, althought I haven´t incorporated it in my own works yet.
Steel is actually a new acquaintance for me and I´m planning to work with steel more in the future.

Metal leafs are a great way to get some of that metallic shine without a complicated casting process. Aluminium, copper, silver and gold also work great in my drawings and enliven the surface reflecting light and creating space.

Working with metal leafs it´s important to not only have calm mind but also calm air conditioning since thin leaves tend to hover about if room has air streaming across it. Also decent tools help out working with metal leafs.